#include <stdio.h>
#include <errno.h>
#include <stdlib.h>

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include <unistd.h>
#include <fcntl.h>

#define BS 4096*3
main(int argc, char ** argv)
{
  int s, n, ns, cond, len, rc, val;
  short port = 6767;
  struct sockaddr_in mysock, peeraddr;
  char buffer[BS];
  char addr[16];
 
  s = socket(PF_INET, SOCK_DGRAM, 0);

  if (argc >= 2) {
    port = atoi(argv[1]);
  };

  mysock.sin_family = AF_INET;
  mysock.sin_port = htons(port);
  mysock.sin_addr.s_addr = INADDR_ANY;
  
  val = 1;
  rc = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(int));
  printf ("setsockopt => %d (%d)\n", rc, errno);
  
  rc = bind(s, (struct sockaddr*) &mysock, sizeof(struct sockaddr_in));
  printf ("bind => %d (%d)\n", rc, errno);
  

  while(1) {

    printf("\n");
    len = sizeof(struct sockaddr_in);
    rc = recvfrom(s, buffer, BS, 0, (struct sockaddr*) &peeraddr, &len); 

    if (rc == -1) printf("recvfrom returned %d (%d)\n", rc, errno);
    else {
      inet_ntop(AF_INET, &peeraddr.sin_addr.s_addr, addr, 16);
      printf("recvfrom got from %s:%d =\"%s\"\n", addr, ntohs(peeraddr.sin_port), buffer);
    };
    sleep(1);
  };
};

/* 
 * Local variables:
 *  compile-command: "gcc -g  -o server server.c"
 * End:
 */